In the pg_trgm module, within function generate_trgm, the memory for trigrams is allocated as follows:
trg = (TRGM *) palloc(TRGMHDRSIZE + sizeof(trgm) * (slen / 2 + 1) *3); I have been trying to understand why this is so because it seems to be allocating more space than that is required. The following table shows the palloced size [(slen / 2 + 1) *3] and the actual trgm count for different string length. slen palloc size actual trgm count 2 6 3 26 42 27 38 60 39 Can somebody please explain this to me. I had tried changing the allocation to slen + 1 and it seemed to be working without any problem. trg = (TRGM *) palloc(TRGMHDRSIZE + sizeof(trgm) * (slen + 1)); Maybe I am missisng some scenarios. Any help would be appreciated. Thank you, Beena Emerson ----- -- Beena Emerson -- View this message in context: http://postgresql.nabble.com/pg-trgm-Memory-Allocation-logic-tp5841088.html Sent from the PostgreSQL - hackers mailing list archive at Nabble.com. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
